supporting science, technology, and improved economic performance and financial literacy in the 21st century. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> woodruff: with 25 days left until the year-end fiscal cliff, and just 19 days until christmas, president obama warned lawmakers today not to add to the holiday pressures americans already feel, by letting the political stalemate drag on. but he also again insisted there would be no deal unless tax rates went up on the wealthy. >> the closer it gets to the brink, the more stressed we're going to be. >> woodruff: president obama made the short trip to northern virginia today to underline his plan to avert the fiscal cliff. at the home of what the white house called a typical middle class family, mr. obama said he's optimistic that agreement can be reached, but again drew a hard line for republicans in congress. >> everybody's is going to have to share in